Bobby Barnett

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Consolacion Ragasa

De La Salle University

Sylvester Adejo (PhD) Associate Professor of Physical and Food Chemistry

Benue State University, Makurdi

Gonzalo Bello

Fundação Oswaldo Cruz

Gabriel Roldan

UNAM Universidad Nacional Autónoma de México

A. Lenharo

Universidade de São Paulo

Juan M O'Connor

Uba

Harold Slavkin

University of Southern California

Khalid Tabbara

King Saud University

J. Castro-rodriguez

Pontificia Universidad Catolica de Chile

Laszlo Boros

University of California, Los Angeles

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Thermitase Variants Having Decreased Adsorption and Increased Hydrolysis

Synthesis, characterization, and electrochemical properties of tertiary diphosphine complexes of technetium: single-crystal structure of the prototype complex trans-[Tc(DPPE)2Br2]BF4

Inorg Chem, 1983

ABSTRACT The Cu(II) and Pd(II) complexes of trans-octaethylchlorin (OEC) and octaethylisobacterio... more ABSTRACT The Cu(II) and Pd(II) complexes of trans-octaethylchlorin (OEC) and octaethylisobacteriochlorin (OEiBC) were synthesized and characterized. The redox behavior of these complexes and of the octaethylporphyrin complexes Cu(OEP) and Pd(OEP) were investigated in nonaqueous media. Potentials were determined by cyclic voltammetry in butyronitrile, methylene chloride, and dimethylformamide solutions. Oxidized and reduced species derived from these complexes were characterized by spectroscopic means. The first oxidation of all six complexes afforded M(II) cation radicals. The palladium(II) hydroporphyrin cation radicals were unstable on the time scale of electrolysis in all three solvents. With the exception of Cu(OEiBC), electrochemical reduction of the complexes afforded M(II) anion radicals. Chemical reduction of these complexes did not give the anion radicals, but instead proceeded directly on to the phlorin anion or chlorin-phlorin anion complexes, M(OEPH)- and M(OECH)-, respectively. Electrochemical or chemical reduction of Cu(OEiBC) afforded the stable diamagnetic Cu(I)(OEiBC)- anion. Unlike other Cu(I)N4 complexes, Cu(I)(OEiBC)- does not appear to have measurable affinity for additional ligands. The rate of oxidation of the highly reducing Cu(I)(OEiBC)- anion by O2 or by alkyl halides is slower than for Ni(I)(OEiBC)-, an anion with a nearly equal reduction potential.

Subtilisin Dy Variants Having Decreased Adsorption and Increased Hydrolysis

Proteinase k variants having decreased adsorption and increased hydrolysis

Subtilisin bpn' variants having decreased adsorption and increased hydrolysis

Structural investigations of calcium-binding molecules. 4. Calcium binding to aminocarboxylates. Crystal structures of Ca(CaEDTA).7H2O and Na(CaNTA)

Inorg Chem, 1979

Isolated bpn' variant having modified amino acid sequence of subtilisin bpn' wild-type amino acid sequence comprising substitution at one or more positions in one of loop regions; cleaning compositions

The crystal structures of two photodimers of 6,6-dimethyl-2,3-benzo-2,4-cycloheptadienone

The structures of two photodimers of 6,6-dimethyl-2,3-benzo-2,4-cycloheptadienone, C26H2802, have... more The structures of two photodimers of 6,6-dimethyl-2,3-benzo-2,4-cycloheptadienone, C26H2802, have been determined from room temperature X-ray diffractometer data. Dimer A crystallizes in the monoclinic space group C2/c with a= 30.141 (16), b= 8-536 (4), c= 15-979 (6) A and fl= 103.1 (2) ° and Z=8. Dimer B crystallizes in the monoclinic space group P2~/c with a = 7.774 (2), b = 15.503 (6), e = 16.752 ,~ and fl= 100.95 (2) ° and Z= 4. Both structures were solved by direct methods and refined by blockdiagonal least-squares techniques to R values of 0.050 (1761 independent reflections) and 0-043 (1172 independent reflections) for dimer A and dimer B respectively. In both molecules the five-to six-membered ring juncture has been found to be cis and the six-to seven-membered ring juncture trans; however, in dimer A the hydrogen atoms H~ and Hc are trans, whereas, in dimer B they are cis. The location of strain in different regions of the two dimers is shown through a comparison of bond lengths and angles and dihedral angles. The conformations of the non-aromatic rings differ in the two molecules, those in dimer A being more flattened than those in dimer B.

Bobby Barnett

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